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Re: electronics question for the tech-heads.


Yes according to the guitarbuilder that built my guitar http://www.nevbornguitars.com/
there's no problem with having a switch . the dummy is just for switching the power on/off.
the "normal pickup goes through the fernandes circuits even when the sustainer is not in use
and then on to the GK output so there's both Gk and normal guitarpickup as well as mixed mode, providing the power's on.
I choose the dummy instead because I thought the switch would be easier to forget,
but the dummy is hard to remember as well so.......
(but it kind of looks cool , I don't know ::::)
Gunnar Backman
Brak(E)man Prod/Brakophonics
E-mail brakophonic@telia.com

2005-02-12 kl. 16.54 skrev L. Angulo:

Now that we are on this topic which i am glad you guys
brought up:
I also installed a sustainer into a roland ready
fender strat,now i dont have any experience with
electronics but the tech told me that in order to use
the sustainer i have to plug a 1/4 inch plug
dummy(like the one on a guitar cable) on the main
guitar jack if i am using the GK-pickup cable.But it
would be great if they could run through the same
GK-pickup jack output and just switch from synth to
guitar mode and use the sustainer,you think this is
possible putting some kind of switch on the guitar?
--- tcombs@sep.com wrote:

In this case I think it would be risky to even try
it. The GK pickup does
not provide it's own power - power, I believe, comes
from another device
such as a GR33 or VG-8. In the configuration you
want to try, the GK
pickup would merely let power flow through it and
into the sustainer
circuit. A hunch tells me that the sustainer
circuitry requires more
amperage than the GK does to operate. Thus, I doubt
the GK power supply
is rated for powering a GK pickup and a sustainer
circuit simultaneously.
If sufficient over current protection is not built
into the device that
provides GK power, you could very well burn
something up not in the GK
pickup, but whatever device is providing GK power.

Checking amperage is not something you can do simply
with a multimeter in
this situation. You'll have to somewhere make a
break in the wire that
carries power to the GK pickup and insert the
multimeter in series with
the flow of power (when you measure voltage you're
actually connecting the
meter in parallel with the circuit under question).
However, an amperage
measurement only tells you how much current is being
drawn by a device -
it tells you nothing about how much current the
power supply is capable of
providing (only the power supply manufacturer can
tell you that).

If it were me, I'd modify my guitar to make the
sustainer battery as
easily accessible as possible, always make sure I
have a backup battery,
and teach myself the habit of unplugging the guitar
when won't be played
for a long duration. I treat batteries like strings
- always have a

Another option - find a wall wart power supply that
is capable of powering
the sustainer circuit, attach a long cable to it,
put a power connector on
your guitar, and wail away.

Best of luck,

Good point Brian, but would it be risky to "try",
could i blow something?
Checking thru the spec of the GK pickup (that
would be providing the
power) there is no mention of power requirments at
all, I guess it has "no
user servicable parts" therfore no info...
(how do i check the amperage anyhow?my simple
multimeter doesnt seem to
have that on it..)


Risky...You also have amperage to consider. Will
the source be able to
handle the amperage that the pickup draws?

I think your best bet is to contact the
manufacturer for the specs.

----- Original Message -----
From: mark francombe
To: loopers-delight@loopers-delight.com
Sent: Friday, February 11, 2005 4:33 PM
Subject: electronics question for the
Sorry for Off topic..

After a few weeks of completely happy and
crazy use of my newly
installed (and now working, thanks to LD people)
Fernandes Sustainer
pickup, I have for the first time left the damn
thing plugged in
overnight, (battery switch on jack socket
arrangment) and drained the
battery. THIS WILL NOT DO! now I could add a power
switch to the
guitar (but then I would no doubt forget that ..)
BUT... I have a cunning plan!!!
I also have a GK midi pickup installed on the
same guitar, and when I
poke around with the multimeter at the socket that
is installed in the
guitar that takes the midi to my synth I find a
pin that seems to have
around 7 volts sitting there. The sustainer pickup
taks a 9 volt
battery (but when I test, again with multimeter)
it also appears to be
around 7 volts.

Now it doesnt take an idiot to realise what
I'm suggesting. I would
like to take the power from the GK midi pickup
cable and connect it to
the sustainer. Which I would have tried already,
but for one little

If I check voltage on the battery with
multimeter connected with BLACK
cable to ground and RED cable to battery.. 7
volts. When I do the same
on this mysterious power wire inside the GK
connector, the multimeter
trys to swing the wrong way, I reverse the multi
meter leads, and then
I get this reading of 7 volts.
Does this mean that the GK pickup is infact
powered by -(minus) 7
volts? ( I've never really understood the concept
of negative volts Im
afraid..) SO.. either I cant use this power, OR I
must reverse the
polarity of it???

Is this possible?





mark francombe

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